package com.paw.ruoyi.admin.aspect;


import java.util.List;

import com.paw.ruoyi.admin.common.context.UserContextHolder;
import com.paw.ruoyi.admin.common.domain.BaseEntity;
import com.paw.ruoyi.admin.annotion.DataScope;
import com.paw.ruoyi.admin.domain.SysRole;
import com.paw.ruoyi.admin.domain.SysUser;
import com.paw.ruoyi.admin.service.ISysRoleService;
import com.paw.ruoyi.admin.service.ISysUserService;
import com.paw.ruoyi.admin.utils.StringUtils;
import org.aspectj.lang.JoinPoint;
import org.aspectj.lang.annotation.Aspect;
import org.aspectj.lang.annotation.Before;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Component;

/**
 * 数据过滤处理
 *
 * @author ruoyi
 */
@Aspect
@Component
public class DataScopeAspect {

  /**
   * 全部数据权限
   */
  public static final String DATA_SCOPE_ALL = "1";

  /**
   * 自定数据权限
   */
  public static final String DATA_SCOPE_CUSTOM = "2";

  /**
   * 部门数据权限
   */
  public static final String DATA_SCOPE_DEPT = "3";

  /**
   * 部门及以下数据权限
   */
  public static final String DATA_SCOPE_DEPT_AND_CHILD = "4";

  /**
   * 仅本人数据权限
   */
  public static final String DATA_SCOPE_SELF = "5";

  /**
   * 数据权限过滤关键字
   */
  public static final String DATA_SCOPE = "dataScope";

  @Autowired
  private ISysUserService sysUserService;

  @Autowired
  private ISysRoleService sysRoleService;

  @Before("@annotation(controllerDataScope)")
  public void doBefore (JoinPoint point, DataScope controllerDataScope) throws Throwable {
    clearDataScope(point);
    handleDataScope(point, controllerDataScope);
  }

  protected void handleDataScope (final JoinPoint joinPoint, DataScope controllerDataScope) {
    // 获取当前的用户
    if (UserContextHolder.getUserId()!=null) {
      SysUser currentUser = sysUserService.selectUserById(UserContextHolder.getUserId());
      // 如果是超级管理员，则不过滤数据
      if (StringUtils.isNotNull(currentUser) && !currentUser.isAdmin()) {
        dataScopeFilter(joinPoint, currentUser, controllerDataScope.deptAlias(),
            controllerDataScope.userAlias());
      }
    }
  }

  /**
   * 数据范围过滤
   *
   * @param joinPoint 切点
   * @param user      用户
   * @param userAlias 别名
   */
  public void dataScopeFilter (JoinPoint joinPoint, SysUser user, String deptAlias, String userAlias) {
    StringBuilder sqlString = new StringBuilder();
    List<SysRole> sysRoles = sysRoleService.selectRolesByUserId(user.getUserId());
    for (SysRole role : sysRoles) {
      String dataScope = role.getDataScope();
      if (DATA_SCOPE_ALL.equals(dataScope)) {
        sqlString = new StringBuilder();
        break;
      } else if (DATA_SCOPE_CUSTOM.equals(dataScope)) {
        sqlString.append(StringUtils.format(
            " OR {}.dept_id IN ( SELECT dept_id FROM sys_role_dept WHERE role_id = {} ) ", deptAlias,
            role.getRoleId()));
      } else if (DATA_SCOPE_DEPT.equals(dataScope)) {
        sqlString.append(StringUtils.format(" OR {}.dept_id = {} ", deptAlias, user.getDeptId()));
      } else if (DATA_SCOPE_DEPT_AND_CHILD.equals(dataScope)) {
        sqlString.append(StringUtils.format(
            " OR {}.dept_id IN ( SELECT dept_id FROM sys_dept WHERE dept_id = {} or find_in_set( {} , ancestors ) )",
            deptAlias, user.getDeptId(), user.getDeptId()));
      } else if (DATA_SCOPE_SELF.equals(dataScope)) {
        if (StringUtils.isNotBlank(userAlias)) {
          sqlString.append(StringUtils.format(" OR {}.user_id = {} ", userAlias, user.getUserId()));
        } else {
          // 数据权限为仅本人且没有userAlias别名不查询任何数据
          sqlString.append(" OR 1=0 ");
        }
      }
    }

    if (StringUtils.isNotBlank(sqlString.toString())) {
      Object params = joinPoint.getArgs()[0];
      if (StringUtils.isNotNull(params) && params instanceof BaseEntity) {
        BaseEntity baseEntity = (BaseEntity) params;
        baseEntity.getParams().put(DATA_SCOPE, " AND (" + sqlString.substring(4) + ")");
      }
    }
  }

  /**
   * 拼接权限sql前先清空params.dataScope参数防止注入
   */
  private void clearDataScope (final JoinPoint joinPoint) {
    Object params = joinPoint.getArgs()[0];
    if (StringUtils.isNotNull(params) && params instanceof BaseEntity) {
      BaseEntity baseEntity = (BaseEntity) params;
      baseEntity.getParams().put(DATA_SCOPE, "");
    }
  }
}
